Good point, but then why did she wear Vice Admiral pips? Of course, the Vice Admiral pips are seen more often than the others. Even Janeway was a Vice Admiral in Nemesis, which would mean she got three promotions in a two year period.

Wardrobe malfunction? Or Shanthi woke up and decide she wanted to throw everyone a curveball and wear the wrong pips? Or she was a changeling infiltrator that screwed up?